ToughButterCup Posted November 13, 2016 Share Posted November 13, 2016 and just like Bernard Cribbins, I'm left wondering how deep it should be? The job? Connect the outfall from the digester to the stream 100 meters away. Across a field that -in season- has cattle on it sometimes. I asked the farmer how deep he wanted it. He had no idea. I've looked at the Regs, and there appears to be no clear guidance. So, I'm asking you for advice, please. I'm thinking about the bloke in the bowler who might come along and scratch his head (0:28) Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 Power has to be 1200mm on ag land - just so when you go along with a subsoiler it doesn't rip it out of the ground ..!! What is the slope from one side to the other of the field ..? Link to comment Share on other sites More sharing options...
Declan52 Posted November 13, 2016 Share Posted November 13, 2016 How deep will depend on how high the outfeed from your digester sits and how much fall you need to get to the steam. Min of 1m I would reckon so the farmer can more or less do whatever he wants with the field with no risk of hitting your pipe. Link to comment Share on other sites More sharing options...
Construction Channel Posted November 13, 2016 Share Posted November 13, 2016 (edited) http://www.ldca.org/LDCA Technical Specification for Field Drainage Schemes 2014.pdf 3.2.4 min 600mm cover but as above this will depend if you need to create a fall or just run with the land also you may want to ask the farmer if there are any existing land drains across the meadow to avoid any issues Edited November 13, 2016 by Construction Channel 1 Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 16 minutes ago, Construction Channel said: http://www.ldca.org/LDCA Technical Specification for Field Drainage Schemes 2014.pdf 3.2.4 min 600mm cover but as above this will depend if you need to create a fall or just run with the land also you may want to ask the farmer if there are any existing land drains across the meadow to avoid any issues Hmm me thinks that link needs pinning ..! Link to comment Share on other sites More sharing options...
Temp Posted November 13, 2016 Share Posted November 13, 2016 2 hours ago, recoveringacademic said: The job? Connect the outfall from the digester to the stream 100 meters away. I remember seeing guidance for stream end (the outfall into the stream). That might set the height that end. Will try and find it. Then working back up from there to the digester you need a fall on the pipe. At 1:40 that would be 2.5 meters over 100m. Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 It won't matter on slope for the outfall as it's a digester output so is clean water - 1:200 will be fine as long as the bottom end is above the flood level of the stream. Maybe put a NRV or rat flap on the end for good measure. Link to comment Share on other sites More sharing options...
Temp Posted November 13, 2016 Share Posted November 13, 2016 Thought I had seen dimensions on the Paving Expert site but I was mistaken. That just refers to.. http://www.pavingexpert.com/drain03.htm "Most local authorities and/or water boards have their own specification for an outfall detail, but the illustration opposite shows the type of scheme favoured by many authorities for small outfalls." Link to comment Share on other sites More sharing options...
Construction Channel Posted November 13, 2016 Share Posted November 13, 2016 as i have thought more about this, assuming you are not crossing any existing land drains you would probably be best to make the bottom of your trench about 900mm, this would leave the top of your 4" pipe (assumption) about 800 down so this would still allow a 6" land drain to cross above it and still get the 600 cover, ya get me?? also map the run accurately and give a copy to the land owner for future reference. Link to comment Share on other sites More sharing options...
ToughButterCup Posted November 13, 2016 Author Share Posted November 13, 2016 OK lads, thanks. Here's my Method Statement (RAMS) . I'm using Ed's reference: LDCA Technical Specification for Field Drainage, and H1 of the Building Regs (as applicable) The job is to lay a pipe across an open field. The pipe takes the discharge for two properties from the digester (sited more than 10 meters away from a water course and other buildings) . That means the discharge water is classified as clean. I think the worst case scenario will be when the farmer decides he wants to deep-plough the field. The land drains which already exist (2) have been surveyed and checked: both of those run in exact parallel, and the pipe I'm laying runs in parallel with them, so there's no fear my work of cutting them. Both of those drains appear to be buried deeper than 1 meter. There is no track in the field. There are no underground services. Our pipe run will be in a dead straight line. I'll use a corrugated plastic pipe. There is at least 5 meters fall over 100 meters run, so I can '...run with the land...' (above) The farmer has assured me that no stock is due to be put on the field this year. The hedge will be dug out and temporary fencing installed pending reinstatement. Access and egress to the work will be through the hedge. The fall to the field to be made up with the spoil from the digester hole and other locally dug materials. That material to be removed at the end of the job. The trench will be dug by machine. The farmer and land owner will be given an accurate sketch map of the pipe position and depth. Ed, ( @Construction Channel) what's the maximum depth that ''deep ploughing' might reach? Wikipedia has it at 50cm.... Do you agree? I recon the risk of that happening is small, though. Link to comment Share on other sites More sharing options...
Construction Channel Posted November 13, 2016 Share Posted November 13, 2016 its not so much the ploughing that you need to worry about. 500mm sounds a very deep plough to me, unless it was a single furrow it would take a hell of a machine to pull it, mole drainers are about the deepest things that will be used. especially as you're running parallel to the existing land drain, moles will run perpendicular above the land drains but usually about 500mm Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 Errr.... the Proforge one my lad used to use will go to 750mm when pulled by something with 200+HP...! as Ed says though - that is the exception ..! If it's all down hill and you're using plastic can the farmer not mole it in for you ..? Link to comment Share on other sites More sharing options...
Construction Channel Posted November 13, 2016 Share Posted November 13, 2016 9 minutes ago, PeterW said: the Proforge one my lad used to use will go to 750mm when pulled by something with 200+HP...! i assume you mean a mole? otherwise that is a very big plough they can mole deeper if it is very fast draining land, but the mole only needs to hit the stone above the land drain and stay below a subsoiler. so it will usually stay as shallow as possible so it is easier to pull. Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 3 leg sub soiler with a set of compacting / breaker rings on the back .... evil thing that only the big JD can pull ..! Link to comment Share on other sites More sharing options...
Construction Channel Posted November 13, 2016 Share Posted November 13, 2016 Nice, thats almost Quadtrack territory Link to comment Share on other sites More sharing options...
PeterW Posted November 13, 2016 Share Posted November 13, 2016 Yeh lucky it's fairly sandy round here although he used to keep a stock of shear pins in the cab... 1 Link to comment Share on other sites More sharing options...
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